(1R)-1-[[[(1,1-Dimethylethyl)diphenylsilyl]oxy]methyl]-1,2-ethanediyl Ester 9-Octadecenoic Acid (9Z) is an intermediate in the synthesis of 1,2-Dioleoyl-rac-glycerol (D482175), which is an analog of 1,3-Dioleoylglycerol (D484210) which is used in the synthesis of amphiphilic gadolinium complexes as MRI contrast agents.